Fluctuations of intensity and arrival angles for light waves in spatially-limited collimated beams in a turbulent atmosphere

This paper presents results of an experimental investigation of fluctuations of intensity and arrival angle as a function of the parameter = ka²/L (where k = 2 /,a is the beam radius, and L is the length of the track) for tracks of different lengths. It is shown that, depending on the value of ₀ ² = 1.23 C _n ² k^7/6 L^11/6, the intensity fluctuations can both increase, and also decrease with increase of . The fluctuations of arrival angle have a maximum for beams for which the parameter 5.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, Vol. 16, No. 9, pp. 108–112, September, 1973.